package com.kkw.shoppingmall.search.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.TypeReference;
import com.kkw.common.to.SkuEsModel;
import com.kkw.common.utils.R;
import com.kkw.shoppingmall.search.config.ShoppingmallSearchConfig;
import com.kkw.shoppingmall.search.constant.EsConstant;
import com.kkw.shoppingmall.search.feign.ProductFeignService;
import com.kkw.shoppingmall.search.service.MallSearchService;
import com.kkw.shoppingmall.search.vo.AttrResponseVo;
import com.kkw.shoppingmall.search.vo.BrandVo;
import com.kkw.shoppingmall.search.vo.SearchParam;
import com.kkw.shoppingmall.search.vo.SearchResult;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.apache.lucene.search.join.ScoreMode;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.index.query.*;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.Aggregation;
import org.elasticsearch.search.aggregations.AggregationBuilders;
import org.elasticsearch.search.aggregations.bucket.nested.NestedAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.nested.ParsedNested;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedLongTerms;
import org.elasticsearch.search.aggregations.bucket.terms.ParsedStringTerms;
import org.elasticsearch.search.aggregations.bucket.terms.Terms;
import org.elasticsearch.search.aggregations.bucket.terms.TermsAggregationBuilder;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.elasticsearch.search.sort.SortOrder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.io.UnsupportedEncodingException;
import java.net.URLEncoder;
import java.util.ArrayList;
import java.util.List;
import java.util.Objects;
import java.util.stream.Collectors;

/**
 * @author Kevin
 * @date 2021-06-06
 **/
@Service
@Slf4j
public class MallSearchServiceImpl implements MallSearchService {

    @SuppressWarnings("all")
    @Autowired
    private RestHighLevelClient client;

    @SuppressWarnings("all")
    @Autowired
    private ProductFeignService productFeignService;

    @Override
    public SearchResult search(SearchParam searchParam) {
        //1、动态构建出查询需要的dsl语句
        SearchRequest searchRequest = buildSearchRequest(searchParam);

        SearchResult result = null;
        try {
            //2、执行检索请求
            SearchResponse response = client.search(searchRequest, ShoppingmallSearchConfig.COMMON_OPTIONS);

            //3、分析响应数据封装成我们需要的格式
            result = buildResullt(response,searchParam);
        } catch (IOException e) {
            e.printStackTrace();
        } finally {

        }
        return result;
    }

    /**
     * 构建检索请求
     *
     * @return
     */
    private SearchRequest buildSearchRequest(SearchParam param) {

        //构建dsl语句
        SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();
        /**
         * 模糊匹配，过滤（按照属性，分类，品牌，价格区间，库存）
         *
         * 1、构建bool - query
         *    1.1、must
         */
        BoolQueryBuilder boolQuery = QueryBuilders.boolQuery();
        if (StringUtils.isNotEmpty(param.getKeyword())) {
            boolQuery.must(QueryBuilders.matchQuery("skuTitle", param.getKeyword()));
        }
        //1.2 filter   按照三级分类id查询的
        if (Objects.nonNull(param.getCatalog3Id())) {
            boolQuery.filter(QueryBuilders.termQuery("catalogId", param.getCatalog3Id()));
        }
        //1.2filter  按照品牌id查询的
        if (Objects.nonNull(param.getBrandId()) && param.getBrandId().size() > 0) {
            boolQuery.filter(QueryBuilders.termsQuery("brandId", param.getBrandId()));
        }
        //1.2filter  按照所有指定的属性查询
        if (param.getAttrs() != null && param.getAttrs().size() > 0) {
            //不能放这里 每一个组合生成的 因为一个id1 对应多种属性  多个id就不能只放一个
//            BoolQueryBuilder nestInnerBoolQuery = QueryBuilders.boolQuery();
            //attrs=1_5寸:8寸&attrs=2_16G:8G  前端这样传回来
            for (String attr : param.getAttrs()) {
                //attr=1_5寸:8寸
                String[] s = attr.split("_");
                //检索的属性id
                String attrId = s[0];
                //检索的属性值
                String[] attrValues = s[1].split(":");
                BoolQueryBuilder nestInnerBoolQuery = QueryBuilders.boolQuery();
                nestInnerBoolQuery.must(QueryBuilders.termQuery("attrs.attrId", attrId));
                nestInnerBoolQuery.must(QueryBuilders.termsQuery("attrs.attrValue", attrValues));
                //ScoreMode.None暂时先不让他参与评分   ！！！！每一个都必须都得生成一个nested查询
                NestedQueryBuilder nestedQuery = QueryBuilders.nestedQuery("attrs", nestInnerBoolQuery, ScoreMode.None);
                boolQuery.filter(nestedQuery);
            }

        }

        //1.2filter  查询是否有库存 默认查询有库存
        if (param.getHasStock()!=null){
            boolQuery.filter(QueryBuilders.termQuery("hasStock", param.getHasStock() == 1));
        }

        //1.2filter  按照价格区间
        if (StringUtils.isNotEmpty(param.getSkuPrice())) {
            //1_500/_500/500_     价格区间只有这三种情况
            /**
             * {
             *           "range": {
             *             "skuPrice": {
             *               "gte": 0,
             *               "lte": 6000
             *             }
             *           }
             *         }
             */
            RangeQueryBuilder rangQuery = QueryBuilders.rangeQuery("skuPrice");
            String[] s = param.getSkuPrice().split("_");
            log.info("传入的区间是: {}", s.toString());
            if (s.length == 2) {
                //区间
                rangQuery.gte(s[0]).lte(s[1]);
            } else if (s.length == 1) {
                if (param.getSkuPrice().startsWith("_")) {
                    rangQuery.lte(s[0]);
                }
                if (param.getSkuPrice().endsWith("_")) {
                    rangQuery.gte(s[0]);
                }
            }
            boolQuery.filter(rangQuery);
        }

        //把以前所有的条件都得拿来进行封装
        sourceBuilder.query(boolQuery);

        /**
         * 排序，分页，高亮
         */
        //2.1排序  sort=saleCount_asc/desc
        //     * sort=skuPrice_asc/desc
        //     * sort=hotScore_asc/desc
        if (StringUtils.isNotEmpty(param.getSort())) {
            String sort = param.getSort();
            String[] s = sort.split("_");
            SortOrder order = s[1].equalsIgnoreCase("asc") ? SortOrder.ASC : SortOrder.DESC;
            sourceBuilder.sort(s[0], order);
        }
        //2.2分页
        //pageNum:1 from:0 size:5  [0,1,2,3,4]
        //pageNum:2 from:5 size:5
        //from=(pageNum-1)*size
        sourceBuilder.from((param.getPageNum() - 1) * EsConstant.PRODUCT_PAGESIZE);
        sourceBuilder.size(EsConstant.PRODUCT_PAGESIZE);

        //2.3高亮
        if (StringUtils.isNotEmpty(param.getKeyword())) {
            HighlightBuilder highlightBuilder = new HighlightBuilder();
            highlightBuilder.field("skuTitle").preTags("<b style='color:red'>").postTags("</b>");
            sourceBuilder.highlighter(highlightBuilder);
        }

        /**
         * 聚合分析
         */
        //构建的dsl语句
        //3.1品牌聚合
        TermsAggregationBuilder brand_agg = AggregationBuilders.terms("brand_agg");
        brand_agg.field("brandId").size(50);
        //品牌的子聚合
        brand_agg.subAggregation(AggregationBuilders.terms("brand_name_agg").field("brandName").size(1));
        brand_agg.subAggregation(AggregationBuilders.terms("brand_img_agg").field("brandImg").size(1));
        sourceBuilder.aggregation(brand_agg);

        //3.2分类聚合 catalog_agg
        TermsAggregationBuilder catalog_agg = AggregationBuilders.terms("catalog_agg").field("catalogId").size(50);
        ;
        catalog_agg.subAggregation(AggregationBuilders.terms("catalog_name_agg").field("catalogName").size(1));
        sourceBuilder.aggregation(catalog_agg);

        //3.3属性聚合  attr_agg
        //自己写的好像有点问题 属性显示不全面
        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");
        TermsAggregationBuilder termsAggregationBuilder = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId").size(10)
                .subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName").size(1))
                .subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue").size(50));
        attr_agg.subAggregation(termsAggregationBuilder);
        sourceBuilder.aggregation(attr_agg);
//        NestedAggregationBuilder attr_agg = AggregationBuilders.nested("attr_agg", "attrs");
//        //子聚合
//        TermsAggregationBuilder attr_id_agg = AggregationBuilders.terms("attr_id_agg").field("attrs.attrId");
//        //子子聚合 2个
//        //聚合分析出当前所有attrId对应的名字
//        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_name_agg").field("attrs.attrName")).size(1);
//        //聚合分析出当前attrid对应的所有可能的属性值 attrvalue
//        attr_id_agg.subAggregation(AggregationBuilders.terms("attr_value_agg").field("attrs.attrValue")).size(50);
//        attr_agg.subAggregation(attr_id_agg);
//        sourceBuilder.aggregation(attr_agg);

        System.out.println(sourceBuilder.toString());
        SearchRequest searchRequest = new SearchRequest(new String[]{EsConstant.PRODUCT_INDEX}, sourceBuilder);


        return searchRequest;
    }

    /**
     * 构建结果数据
     *
     * @param response
     * @return
     */
    private SearchResult buildResullt(SearchResponse response, SearchParam param) {

        SearchResult result = new SearchResult();
        //1、返回的所有查询到的商品
        SearchHits hits = response.getHits();

        List<SkuEsModel> esModelList = new ArrayList<>();
        if (hits.getHits() != null && hits.getHits().length > 0) {
            for (SearchHit hit : hits.getHits()) {
                String sourceAsString = hit.getSourceAsString();
                SkuEsModel esModel = JSON.parseObject(sourceAsString, SkuEsModel.class);
                HighlightField skuTitle = hit.getHighlightFields().get("skuTitle");
                if (skuTitle!=null){
                    //设置高亮
                    String string = skuTitle.getFragments()[0].string();
                    esModel.setSkuTitle(string);
                }
                esModelList.add(esModel);
            }
        }
        result.setProduct(esModelList);

        //2、当前所有商品涉及到的所有属性信息
        ParsedNested attr_agg = response.getAggregations().get("attr_agg");
        ParsedLongTerms attr_id_agg = attr_agg.getAggregations().get("attr_id_agg");

        List<SearchResult.AttrVo> attrs=new ArrayList<>();
        for (Terms.Bucket bucket : attr_id_agg.getBuckets()) {
            SearchResult.AttrVo attrVo = new SearchResult.AttrVo();
            //1、得到属性的id
            long attrId = bucket.getKeyAsNumber().longValue();
            attrVo.setAttrId(attrId);
            //2、得到属性的名字
            String attrName = ((ParsedStringTerms) bucket.getAggregations().get("attr_name_agg")).getBuckets().get(0).getKeyAsString();
            attrVo.setAttrName(attrName);
            //3、得到当前属性的所有值
            List<String> attrValue = ((ParsedStringTerms) bucket.getAggregations().get("attr_value_agg")).getBuckets().stream().map(item -> {
                String keyAsString = ((Terms.Bucket) item).getKeyAsString();
                return keyAsString;
            }).collect(Collectors.toList());
            attrVo.setAttrValue(attrValue);

            //这个面包屑里面的已经选过了不会再重复选
            result.getAttrIds().add(attrId);

            attrs.add(attrVo);
        }
        result.setAttrs(attrs);
        //3、当前所有商品涉及到的所有品牌信息
        List<SearchResult.BrandVo> brandVos = new ArrayList<>();
        ParsedLongTerms brand_agg = response.getAggregations().get("brand_agg");
        for (Terms.Bucket bucket : brand_agg.getBuckets()) {
            SearchResult.BrandVo brandVo = new SearchResult.BrandVo();
            //1、得到品牌的id
            long brandId = bucket.getKeyAsNumber().longValue();
            brandVo.setBrandId(brandId);
            //2、得到品牌的名字
            String brandName = ((ParsedStringTerms) bucket.getAggregations().get("brand_name_agg")).getBuckets().get(0).getKeyAsString();
            brandVo.setBrandName(brandName);
            //3、得到品牌的图片
            String brandImg = ((ParsedStringTerms) bucket.getAggregations().get("brand_img_agg")).getBuckets().get(0).getKeyAsString();
            brandVo.setBrandImg(brandImg);
            brandVos.add(brandVo);
        }

        //4、当前所有商品涉及到的所有品牌信息
        List<SearchResult.CatalogVo> catalogVos = new ArrayList<>();
        ParsedLongTerms catalog_agg = response.getAggregations().get("catalog_agg");
        for (Terms.Bucket bucket : catalog_agg.getBuckets()) {
            SearchResult.CatalogVo catalogVo = new SearchResult.CatalogVo();
            //得到分类id
            String keyAsString = bucket.getKeyAsString();
            catalogVo.setCatalogId(Long.parseLong(keyAsString));
            //得到分类名字
            ParsedStringTerms catalog_name_agg = bucket.getAggregations().get("catalog_name_agg");
            String catalog_name = catalog_name_agg.getBuckets().get(0).getKeyAsString();
            catalogVo.setCatalogName(catalog_name);
            catalogVos.add(catalogVo);
        }

        //5、分页信息  页码
        result.setPageNum(param.getPageNum());
//        //5、分页信息  总记录数
        long total = hits.getTotalHits().value;
        result.setTotal(total);
//        //5、分页信息  总页码 计算得到
        int totalPages = (int) total % EsConstant.PRODUCT_PAGESIZE == 0 ? ((int) total / EsConstant.PRODUCT_PAGESIZE) : ((int) total / EsConstant.PRODUCT_PAGESIZE + 1);
        result.setTotalPages(totalPages);
        //可遍历的页码
        ArrayList<Integer> pageNavs = new ArrayList<>();
        for (int i = 1; i < totalPages; i++) {
            pageNavs.add(i);
        }

        result.setPageNavs(pageNavs);

        //6、面包屑导航
        //6 构建面包屑导航功能 属性
        if (param.getAttrs() != null && param.getAttrs().size() > 0) {
            List<SearchResult.NavVo> navVos = param.getAttrs().stream().map(attr -> {
                SearchResult.NavVo navVo = new SearchResult.NavVo();
                //1 分析每个attrs传过来的查询参数值
                //attrs=2_5寸:6寸
                String[] s = attr.split("_");
                navVo.setNavValue(s[1]);
                R r = productFeignService.attrInfo(Long.parseLong(s[0]));
//                result.getAttrIds().add(Long.parseLong(s[0]));
                if (r.getCode() == 0) {
                    //正常返回
                    AttrResponseVo data = r.getData("attr", new TypeReference<AttrResponseVo>() {});
                    navVo.setNavName(data.getAttrName());
                } else {
                    //如果失败
                    navVo.setNavName(s[0]);
                }

                //2 取消了面包屑以后 我们要跳转到哪个地方 将请求地址的url里面的当前请求参数置空
                //拿到所有的查询条件 去掉当前
                String replace = replaceQueryString(param, attr, "attrs");
                navVo.setLink("http://search.shoppingmall.com/list.html?" + replace);
                return navVo;
            }).collect(Collectors.toList());
            result.setNavs(navVos);
        }

        //品牌，分类 面包屑
        if(param.getBrandId() != null && param.getBrandId().size()>0) {
            List<SearchResult.NavVo> navs = result.getNavs();
            SearchResult.NavVo navVo = new SearchResult.NavVo();
            navVo.setNavName("品牌");
            //TODO 远程查询
            R r = productFeignService.BrandsInfo(param.getBrandId());
            if (r.getCode() == 0) {
                List<BrandVo> brands = r.getData("brand", new TypeReference<List<BrandVo>>() {});
                StringBuffer buffer = new StringBuffer();
                String replace = "";
                for (BrandVo brandVo : brands) {
                    buffer.append(brandVo.getBrandName() + ";");
                    replace = replaceQueryString(param, brandVo.getBrandId()+"", "brandId");
                }
                navVo.setNavValue(buffer.toString());
                navVo.setLink("http://search.shoppingmall.com/list.html?" + replace);
            }
            navs.add(navVo);
        }

        //返回这个大对象给前端
        return result;
    }


    //编写面包屑的功能时，删除指定请求
    private String replaceQueryString(SearchParam param, String value,String key) {
        String encode = "";
        try {
            encode = URLEncoder.encode(value, "UTF-8");
            //+ 对应浏览器的%20编码
            encode = encode.replace("+","%20");
        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return  param.get_queryString().replace("&" + key + "=" + encode, "");
    }
}

